JP3301165B2 - Induction motor control device - Google Patents
Induction motor control deviceInfo
- Publication number
- JP3301165B2 JP3301165B2 JP14049693A JP14049693A JP3301165B2 JP 3301165 B2 JP3301165 B2 JP 3301165B2 JP 14049693 A JP14049693 A JP 14049693A JP 14049693 A JP14049693 A JP 14049693A JP 3301165 B2 JP3301165 B2 JP 3301165B2
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- Japan
- Prior art keywords
- current
- calculating
- frequency
- induction motor
- voltage
- Prior art date
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- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
- Rectifiers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、誘導電動機を制御する
ＰＷＭインバータの出力電圧の制御方法に関し、特に出
力トルクの改善を図るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an output voltage of a PWM inverter for controlling an induction motor, and more particularly to an improvement in output torque.
【０００２】[0002]
【従来の技術】誘導電動機の速度を制御する場合、図４
のような構成のインバータを広く使用されている。図に
おいて、交流電源１とダイオードブリッジからなる整流
回路２と平滑コンデンサ３と、スイッチング素子とフラ
イホイールダイオードからなるＰＷＭインバータ４と、
電流検出器７と、インバータ制御回路５により構成され
た制御装置によって誘導電動機６が速度制御される。2. Description of the Related Art When controlling the speed of an induction motor, FIG.
Inverters having such a configuration are widely used. In the figure, a rectifier circuit 2 including an AC power supply 1 and a diode bridge, a smoothing capacitor 3, a PWM inverter 4 including a switching element and a flywheel diode,
The speed of the induction motor 6 is controlled by a control device including the current detector 7 and the inverter control circuit 5.
【０００３】インバータ制御回路５は設定の周波数から
出力電圧を演算し、ＰＷＭインバータ４を駆動する。図
５にインバータ制御回路５の基本ブロックを示す。周波
数設定手段１６の出力は設定周波数と出力電圧の関係を
決定するＶ／Ｆパターン演算手段１７に入力される。さ
らに周波数設定手段１６とＶ／Ｆパターン演算手段１７
からＰＷＭパルスを演算するＰＷＭ演算手段２２を通し
てＰＷＭインバータ４を駆動する。電流検出器７は誘導
電動機６の１次電流を検出している。An inverter control circuit 5 calculates an output voltage from a set frequency and drives the PWM inverter 4. FIG. 5 shows a basic block of the inverter control circuit 5. The output of the frequency setting means 16 is input to a V / F pattern calculating means 17 for determining the relationship between the set frequency and the output voltage. Further, frequency setting means 16 and V / F pattern calculating means 17
The PWM inverter 4 is driven through a PWM calculating means 22 which calculates a PWM pulse from the PWM inverter 4. The current detector 7 detects a primary current of the induction motor 6.
【０００４】図６はＶ／Ｆパターン演算手段１７の設定
周波数と出力電圧の関係を表している。図６でｆｂは基
底周波数で、この周波数では出力電圧は電源電圧で決ま
る最大値Ｖｉをとる。誘導電動機６により大きなトルク
が必要な場合には図６のＶ／Ｆ（ａ）のように大きいＶ
／Ｆ特性を予め設定する。FIG. 6 shows the relationship between the set frequency of the V / F pattern calculation means 17 and the output voltage. In FIG. 6, fb is a base frequency at which the output voltage takes a maximum value Vi determined by the power supply voltage. When a large torque is required for the induction motor 6, a large V / F (a) as shown in FIG.
/ F characteristic is set in advance.
【０００５】誘導電動機６の負荷状態に応じ自動的に、
かつ上記の設定Ｖ／Ｆパターンより特に低周波数領域で
トルク特性を改善させる方法として、図４の電流検出器
７の出力から１次電流の位相を検出して出力電圧を上げ
る方法と、（数１）のように１次電圧1を演算して１次
抵抗電圧降下を補償する方法がある。ただし、（数１）
でＥｏは設定Ｖ／Ｆパターンで決まる誘起電圧で、Ｒ1
は誘導電動機の１次抵抗の設定値でありＩ1は１次電流
の値である。[0005] Automatically according to the load state of the induction motor 6,
In addition, as a method of improving the torque characteristic particularly in a low frequency region from the above set V / F pattern, a method of detecting the phase of the primary current from the output of the current detector 7 in FIG. As in 1), there is a method of calculating the primary voltage 1 to compensate for the primary resistance voltage drop. However, (Equation 1)
And Eo is the induced voltage determined by the set V / F pattern, and R 1
Is the set value of the primary resistance of the induction motor, and I 1 is the value of the primary current.
【０００６】[0006]
【数１】 (Equation 1)
【０００７】[0007]
【発明が解決しようとする課題】しかしながら上記での
従来の構成において、予め設定するＶ／Ｆパターン方式
では特に低周波領域でのトルクの増加を図った場合に誘
導電動機の励磁電流が増加し過励磁状態となるばかりで
なく十分なトルクも期待できない。However, in the above-described conventional configuration, the excitation current of the induction motor increases due to the increase in the torque of the induction motor, especially in the case of increasing the torque in the low frequency region, in the preset V / F pattern system. Not only is it in an excited state, but it is not possible to expect sufficient torque.
【０００８】自動トルクブーストでは、負荷に応じた位
相の変化から電圧を補正しトルクブーストをかける方法
では特に低速での位相の検出遅れが応答性能を悪化させ
ることや、１次抵抗の電圧降下分の補正による方法では
過励磁の回避は図れるものの、図７のように低周波数領
域では１次電流対トルク特性は単調増加に必ずしもなら
ないためトルク特性改善はあまり効果は期待できなかっ
た。図７で横軸Ｔは出力トルクを表しており、図７の特
性でＶ／Ｆ（ａ），Ｖ／Ｆ（ｂ），Ｖ／Ｆ（ｃ）は各々
図６に示したＶ／Ｆパターンに対応している。In the automatic torque boost, in the method of applying the torque boost by correcting the voltage from the phase change according to the load, particularly, the delay in detecting the phase at low speed deteriorates the response performance, and the voltage drop of the primary resistance is reduced. Although the overexcitation can be avoided by the method using the correction of (1), the primary current-torque characteristic does not necessarily increase monotonically in the low frequency region as shown in FIG. 7, the horizontal axis T represents the output torque, and V / F (a), V / F (b) and V / F (c) are the V / F patterns shown in FIG. It corresponds to.
【０００９】１次電流対負荷特性の改善として１次電流
の最小値を追跡しながら制御する方法も提案されている
が応答速度の悪化を招く。さらに負荷時にはすべりのた
め２次回路のインピーダンス低下により励磁電流が減少
するのでトルク改善の効果は期待できない。As a method of improving the primary current-load characteristics, a method of controlling while tracking the minimum value of the primary current has been proposed, but the response speed is deteriorated. In addition, the effect of torque improvement cannot be expected because the exciting current decreases due to a decrease in the impedance of the secondary circuit due to slippage at the time of load.
【００１０】本発明の目的は、設定周波数や負荷状態に
拘らず良好な出力トルク特性を得ることができるように
した誘導電動機の制御装置を提供することにある。An object of the present invention is to provide a control device for an induction motor which can obtain good output torque characteristics regardless of a set frequency and a load state.
【００１１】[0011]
【課題を解決するための手段】この目的を達成するため
に本発明の誘導電動機の制御装置は、誘導電動機のトル
ク電流と励磁電流と１次電流を検出し演算する手段と、
励磁電流の設定値と励磁電流検出手段の差を比例積分す
る励磁電圧補償手段と、誘起電圧と出力周波数の関係を
決定するＶ／Ｆパターン演算手段と、誘導電動機定数と
トルク電流と励磁電流と１次電流と励磁電圧補償手段と
Ｖ／Ｆパターン演算手段とから１次電圧を演算する１次
電圧演算手段と、誘導電動機定数とトルク電流と励磁電
流からすべり周波数を演算する１次周波数演算手段を設
けた構成を有している。In order to achieve this object, a control device for an induction motor according to the present invention comprises a torque converter for an induction motor.
Means for detecting and calculating the peak current, the exciting current, and the primary current,
Excitation voltage compensating means for proportionally integrating the difference between the set value of the exciting current and the exciting current detecting means, V / F pattern calculating means for determining the relationship between the induced voltage and the output frequency, induction motor constant, torque current, exciting current and Primary voltage calculating means for calculating the primary voltage from the primary current, the exciting voltage compensating means and the V / F pattern calculating means, and primary frequency calculating means for calculating the slip frequency from the induction motor constant, the torque current and the exciting current Is provided.
【００１２】[0012]
【作用】この構成によって、印加すべき１次電圧は１次
インピーダンスによる電圧降下分の補正をし、負荷変動
に伴う励磁電流の低下を抑制して誘起電圧の安定化を図
っており、かつ１次周波数は誘導電動機のすべりによる
すべり周波数低下分を設定周波数に加えて周波数低下分
の補償をしているので、広汎な周波数領域で十分なトル
クを得ることができる。With this configuration, the primary voltage to be applied corrects the voltage drop due to the primary impedance, suppresses the decrease in the exciting current due to the load fluctuation, and stabilizes the induced voltage. The next frequency compensates for the decrease in frequency by adding the decrease in slip frequency due to slippage of the induction motor to the set frequency, so that sufficient torque can be obtained in a wide frequency range.
【００１３】[0013]
【実施例】以下、本発明の一実施例を図面によって説明
する。An embodiment of the present invention will be described below with reference to the drawings.
【００１４】図１は本発明による一実施例によるブロッ
ク図である。図１（ａ）において、電流検出器７，８は
ＰＷＭインバータの２相の出力電流を検出し、インバー
タ制御回路５に入力する。他の構成は図４と同様であ
る。図１（ｂ）はインバータ制御回路５の構成である。
図１（ｂ）において、９はトルク電流検出手段、１０は
励磁電流検出手段、１１は１次電流演算手段、１２は励
磁電流設定手段、１３は励磁電圧補償手段、１４はトル
ク電流誤差設定手段、１５はトルク電流演算手段、１６
は周波数設定手段、１７はＶ／Ｆパターン演算手段、１
８は誘導電動機定数設定手段、１９は１次電圧演算手
段、２０はすべり周波数演算手段、２１は１次周波数演
算手段、２２はＰＷＭ演算手段である。FIG. 1 is a block diagram according to one embodiment of the present invention. In FIG. 1A, current detectors 7 and 8 detect two-phase output currents of a PWM inverter and input the detected currents to an inverter control circuit 5. Other configurations are the same as those in FIG. FIG. 1B shows the configuration of the inverter control circuit 5.
In FIG. 1B, 9 is a torque current detecting means, 10 is an exciting current detecting means, 11 is a primary current calculating means, 12 is an exciting current setting means, 13 is an exciting voltage compensating means, and 14 is a torque current error setting means. , 15 are torque current calculation means, 16
Is a frequency setting means, 17 is a V / F pattern calculating means, 1
8 is an induction motor constant setting means, 19 is a primary voltage calculating means, 20 is a slip frequency calculating means, 21 is a primary frequency calculating means, and 22 is a PWM calculating means.
【００１５】電流検出器７，８の出力は、１次出力電圧
の回転角を用いて回転座標系から静止座標系への変換手
段ｄ−ｑ変換によって、誘導電動機６のトルク電流およ
び励磁電流を演算するトルク電流検出手段９および励磁
電流検出手段１０に入力される。トルク電流検出手段９
と励磁電流検出手段１０から誘導電動機６の１次電流が
１次電流演算手段１１で演算される。励磁電圧補償手段
１３は励磁電流設定手段１２と励磁電流検出手段１０の
差を比例積分している。The outputs of the current detectors 7 and 8 convert the torque current and the excitation current of the induction motor 6 by the dq conversion from the rotating coordinate system to the stationary coordinate system using the rotation angle of the primary output voltage. It is input to the torque current detecting means 9 and the exciting current detecting means 10 for calculating. Torque current detecting means 9
The primary current of the induction motor 6 is calculated by the primary current calculator 11 from the excitation current detector 10. The exciting voltage compensating means 13 proportionally integrates the difference between the exciting current setting means 12 and the exciting current detecting means 10.
【００１６】図２に誘導電動機６のベクトル図を示す。
誘起電圧Ｅ0と空隙磁束Φ0は直交している。理想的には
トルク電流はＥ0と、励磁電流はΦ0と同相であるが座標
変換のｄ−ｑ軸を図のようにとっているため誤差を生じ
る。そこでこれを補正するため図１に示すトルク電流誤
差設定手段１４には無負荷時の変換誤差に相当するトル
ク電流を予め設定してある。トルク電流検出手段９とト
ルク電流誤差設定手段１４からトルク電流演算手段１５
を通して実際のトルク電流を求めている。励磁電流は励
磁電圧補償手段１３で補正をかけることになるので座標
変換に基づく補正は特にする必要はない。周波数設定手
段１６の出力は誘導電動機６の誘起電圧との関係を決定
するＶ／Ｆパターン演算手段１７で周波数に応じた電圧
に変換される。誘導電動機定数設定手段１８には誘導電
動機６の１次抵抗等インピーダンスパラメータが設定さ
れている。FIG. 2 shows a vector diagram of the induction motor 6.
The induced voltage E 0 is orthogonal to the air gap magnetic flux Φ 0 . Ideally, the torque current is in phase with E 0 and the exciting current is in phase with Φ 0 , but an error occurs because the dq axes of coordinate conversion are taken as shown in the figure. Therefore, in order to correct this, a torque current corresponding to a conversion error at the time of no load is preset in the torque current error setting means 14 shown in FIG. From the torque current detecting means 9 and the torque current error setting means 14 to the torque current calculating means 15
To obtain the actual torque current. Since the exciting current is corrected by the exciting voltage compensating means 13, it is not necessary to perform the correction based on the coordinate transformation. The output of the frequency setting means 16 is converted to a voltage corresponding to the frequency by a V / F pattern calculating means 17 which determines the relationship with the induced voltage of the induction motor 6. An impedance parameter such as a primary resistance of the induction motor 6 is set in the induction motor constant setting means 18.
【００１７】トルク電流演算手段１５の出力をＩｔ、励
磁電流検出手段１０の出力をＩｍ、誘導電動機定数設定
手段１８のインピーダンスパラメータの１次抵抗を
Ｒ1、１次漏れインダクタンスをＬ1とし、励磁電圧補償
手段１３の出力をΔＶとして、１次周波数をｆ1とすれ
ば、１次電圧Ｖ1は図２のベクトル図から（数２）に基
づいて１次電圧演算手段１９で演算する。（数２）でθ
は図２の位相角である。The output of the torque current calculating means 15 is It, the output of the exciting current detecting means 10 is Im, the primary resistance of the impedance parameter of the induction motor constant setting means 18 is R 1 , and the primary leakage inductance is L 1. Assuming that the output of the voltage compensating means 13 is ΔV and the primary frequency is f 1 , the primary voltage V 1 is calculated by the primary voltage calculating means 19 based on (Equation 2) from the vector diagram of FIG. (Equation 2) gives θ
Is the phase angle in FIG.
【００１８】[0018]
【数２】 (Equation 2)
【００１９】（数２）で第２項と第３項は低周波数領域
のみでなく基底周波数以下での１次インピーダンスによ
る電圧降下分の補償をしている。第４項は負荷状態によ
る励磁電流の低下を防ぎ、積分項によって定常偏差をな
くすようにしているので定常状態でも安定した補償が可
能である。またこのためＥ0とＶ／Ｆパターンの最小値
でよく１次電流対負荷特性は単調増加関数となるため１
次電流のフィードバックを確実にかけることができる。
なお、励磁電流検出手段１０のかわりに励磁電圧補償手
段１３のゲインを調整したものを使用すれば、ΔＶの項
を設ける必要なく同様の特性が得られる。In equation (2), the second and third terms compensate not only for the low frequency region but also for the voltage drop due to the primary impedance below the base frequency. The fourth term prevents a decrease in the exciting current due to the load state, and eliminates the steady-state error by the integral term, so that stable compensation can be performed even in the steady state. In addition, E 0 and the minimum value of the V / F pattern are sufficient, and the primary current-load characteristic becomes a monotonically increasing function.
The feedback of the secondary current can be reliably applied.
If a gain-adjusted excitation voltage compensating means 13 is used instead of the exciting current detecting means 10, the same characteristics can be obtained without the need to provide a ΔV term.
【００２０】さらに１次周波数は、トルク電流演算手段
１５と励磁電流設定手段１２および誘導電動機定数設定
手段１８からすべり周波数演算手段２０ですべり周波数
を演算し、周波数設定手段１６の出力に加算する１次周
波数演算手段２１で得る。１次電圧演算手段１９と１次
周波数演算手段２１からＰＷＭ演算手段２２でＰＷＭパ
ルスを演算し、その出力でＰＷＭインバータ４を駆動す
る。このようにしてすべて周波数を補償するので負荷状
態に拘らず同期速度に近い特性が得られ、安定して高ト
ルクが得られる。なお、すべり周波数演算手段２０では
すべり周波数を一定範囲内に制限する制限機能を有して
いる。Further, the primary frequency is calculated by the slip frequency calculating means 20 from the torque current calculating means 15, the exciting current setting means 12 and the induction motor constant setting means 18 and added to the output of the frequency setting means 16. It is obtained by the next frequency calculating means 21. The PWM pulse is calculated by the PWM calculating means 22 from the primary voltage calculating means 19 and the primary frequency calculating means 21, and the output thereof drives the PWM inverter 4. Since all frequencies are compensated in this manner, characteristics close to the synchronous speed can be obtained regardless of the load state, and high torque can be obtained stably. The slip frequency calculating means 20 has a function of limiting the slip frequency to a certain range.
【００２１】励磁電流は、図３のように周波数によって
無負荷時の１次電流の位相が変化するため周波数依存性
を有するが、特に低周波数領域での過励磁が問題となる
ことがある。このため励磁電流設定手段１２は、図３の
補正係数Ｋのような周波数特性をもつ係数をかけて補正
する係数手段を持たせ、励磁電流が図の補正後の１次電
流のように周波数に拘らずフラットな特性になるように
補正する場合がある。このようにすれば、低周波数領域
でも過励磁状態にならず最適な１次電流で十分な出力ト
ルクを得ることができる。The exciting current has frequency dependence because the phase of the primary current at the time of no load changes depending on the frequency as shown in FIG. 3, but overexcitation in a low frequency region may cause a problem. For this reason, the exciting current setting means 12 has a coefficient means for performing correction by multiplying by a coefficient having a frequency characteristic such as the correction coefficient K in FIG. 3 so that the exciting current is adjusted to a frequency like the corrected primary current in the figure. Regardless, there is a case where correction is performed so as to obtain a flat characteristic. In this way, a sufficient output torque can be obtained with an optimal primary current without overexcitation even in a low frequency range.
【００２２】励磁電圧補償手段１３では励磁電流の設定
が誘導電動機の実際の検出値よりも大幅に低い場合には
加速時や定常時でも負の値をとる場合があるので励磁電
圧の補償ができないことがある。このため励磁電圧補償
手段１３の負の値をとらないように出力制限をしてい
る。加速時に励磁電流の誤差分が積分され定常状態では
積分値が維持される。減速時には誤差分が負の値をとる
ため零になるまで減算されるが、フリーラン等運転中の
出力遮断で停止させる場合には積分値が零まで減算され
ず積分値が残留する場合がある。この積分値が大きく残
留していると、誘導電動機６が再始動するとき（数２）
のΔＶが大きな値をとるため低周波数でいきなり大きな
１次電圧Ｖ1を印加することになり過電流が流れること
がある。このためインバータ制御回路５の出力遮断時に
励磁電圧補償手段１３の積分値をリセットする。If the setting of the exciting current is much lower than the actual detection value of the induction motor, the exciting voltage compensating means 13 cannot take a negative value even during acceleration or steady state, so that the exciting voltage cannot be compensated. Sometimes. For this reason, the output is limited so that the exciting voltage compensating means 13 does not take a negative value. The error of the exciting current is integrated during acceleration, and the integrated value is maintained in a steady state. At the time of deceleration, the error is a negative value, so it is subtracted until it becomes zero, but when it is stopped due to output cutoff during operation such as coasting, the integrated value may not be reduced to zero and the integrated value may remain . If this integral value remains large, when the induction motor 6 restarts (Equation 2)
There is an overcurrent flows will be to apply a large primary voltages V 1 suddenly at low frequencies because ΔV takes a large value. Therefore, when the output of the inverter control circuit 5 is cut off, the integral value of the excitation voltage compensating means 13 is reset.
【００２３】[0023]
【発明の効果】以上のように本発明は、誘導電動機のト
ルク電流と励磁電流を１次電流を検出し演算する手段
と、励次電流の設定値と励磁電流検出手段の差を比例積
分する励磁電圧補償手段と、誘起電圧と出力周波数の関
係を決定するＶ／Ｆパターン演算手段と、誘導電動機定
数とトルク電流と励磁電流と１次電流と励磁電圧補償手
段とＶ／Ｆパターン演算手段とから１次電圧を演算する
１次電圧演算手段と、誘導電動機定数とトルク電流と励
磁電流からすべり周波数を演算する１次周波数演算手段
を設けることにより、広汎な周波数範囲で、特に低周波
数領域でも安定して十分な出力トルクが得られる優れた
誘導電動機の制御装置を実現できる。As described above, according to the present invention, means for detecting and calculating the primary current of the torque current and the exciting current of the induction motor, and proportionally integrating the difference between the set value of the exciting current and the exciting current detecting means. Exciting voltage compensating means, V / F pattern calculating means for determining the relationship between induced voltage and output frequency, induction motor constant, torque current, exciting current, primary current, exciting voltage compensating means, V / F pattern calculating means. And a primary frequency calculating means for calculating a slip frequency from an induction motor constant, a torque current and an exciting current, thereby providing a wide range of frequencies, especially in a low frequency range. An excellent induction motor control device capable of stably obtaining a sufficient output torque can be realized.
【図１】（ａ）は本発明の一実施例における誘導電動機
の制御装置のブロック図 （ｂ）は本実施例におけるインバータ制御装置のブロッ
ク図FIG. 1A is a block diagram of a control device for an induction motor according to an embodiment of the present invention; FIG. 1B is a block diagram of an inverter control device according to the embodiment;
【図２】誘導電動機のベクトル図FIG. 2 is a vector diagram of an induction motor.
【図３】誘導電動機の励磁電流補正の説明図FIG. 3 is an explanatory diagram of excitation current correction of an induction motor.
【図４】従来の誘導電動機の制御装置のブロック図FIG. 4 is a block diagram of a conventional induction motor control device.
【図５】従来のインバータ制御回路の基本ブロック図FIG. 5 is a basic block diagram of a conventional inverter control circuit.
【図６】従来例のＶ／Ｆ特性図FIG. 6 is a V / F characteristic diagram of a conventional example.
【図７】従来例の１次電流対トルク特性図FIG. 7 is a diagram showing primary current versus torque characteristics of a conventional example.
１ 交流電源 ２ 整流回路 ３ 平滑コンデンサ ４ ＰＷＭインバータ ５ インバータ制御回路 ６ 誘導電動機 ７，８ 電流検出器 ９ トルク電流検出手段 １０ 励磁電流検出手段 １１ １次電流演算手段 １２ 励磁電流設定手段 １３ 励磁電圧補償手段 １４ トルク電流誤差設定手段 １５ トルク電流演算手段 １６ 周波数設定手段 １７ Ｖ／Ｆパターン演算手段 １８ 誘導電動機定数設定手段 １９ １次電圧演算手段 ２０ すべり周波数演算手段 ２１ １次周波数演算手段 ２２ ＰＷＭ演算手段 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Rectifier circuit 3 Smoothing capacitor 4 PWM inverter 5 Inverter control circuit 6 Induction motor 7, 8 Current detector 9 Torque current detection means 10 Excitation current detection means 11 Primary current calculation means 12 Excitation current setting means 13 Excitation voltage compensation Means 14 Torque current error setting means 15 Torque current calculating means 16 Frequency setting means 17 V / F pattern calculating means 18 Induction motor constant setting means 19 Primary voltage calculating means 20 Slip frequency calculating means 21 Primary frequency calculating means 22 PWM calculating means
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−183291（ＪＰ，Ａ) 特開 平４−304184（ＪＰ，Ａ) 特開 昭61−76092（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02P 5/408 - 5/412 H02P 7/628 - 7/632 H02P 21/00 H02M 7/00 - 7/98 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-183291 (JP, A) JP-A-4-304184 (JP, A) JP-A-61-76092 (JP, A) (58) Investigation Field (Int.Cl. 7 , DB name) H02P 5/408-5/412 H02P 7/628-7/632 H02P 21/00 H02M 7/00-7/98
Claims (3)
る整流平滑回路と、直流電圧を交流電圧に変換するＰＷ
Ｍインバータと、前記ＰＷＭインバータの２相以上の出
力電流を検出する電流検出器と、前記ＰＷＭインバータ
の出力周波数と出力電圧を制御するインバータ制御回路
とを含む誘導電動機の制御装置において、前記インバー
タ制御回路は、前記電流検出器から誘導電動機のトルク
電流を演算するトルク電流検出手段および励磁電流を演
算する励磁電流検出手段と、無負荷時のトルク電流誤差
を設定するトルク電流誤差設定手段と、前記トルク電流
検出手段と前記トルク電流誤差設定手段からトルク電流
を演算するトルク電流演算手段と、前記トルク電流検出
手段と前記励磁電流検出手段から１次電流を演算する１
次電流演算手段と、予め誘導電動機の励磁電流を設定し
た励磁電流設定手段と、前記励磁電流設定手段と前記励
磁電流検出手段の差を比例積分制御する励磁電圧補償手
段と、出力周波数を設定する周波数設定手段と、誘導電
動機の誘起電圧と前記周波数設定手段の関係を決定する
Ｖ／Ｆパターン演算手段と、予め誘導電動機の定数を設
定した誘導電動機定数設定手段と、前記Ｖ／Ｆパターン
演算手段と前記電動機定数設定手段と前記１次電流演算
手段と前記トルク電流演算手段と前記励磁電流検出手段
と前記励磁電圧補償手段から１次電圧を演算する１次電
圧演算手段と、前記トルク電流演算手段と前記励磁電流
設定手段と前記誘導電動機定数設定手段とからすべり周
波数を演算し最大値を制限するすべり周波数演算手段
と、前記周波数設定手段とすべり周波数演算手段から１
次周波数を演算する１次周波数演算手段と、前記１次電
圧演算手段と前記１次周波数演算手段からＰＷＭパルス
を演算するＰＷＭ演算手段を備え、ＰＷＭパルス制御す
ることを特徴とする誘導電動機の制御装置。A rectifying / smoothing circuit for rectifying and smoothing an AC power supply to obtain a DC voltage, and a PW for converting the DC voltage to an AC voltage.
An inverter control circuit for controlling an output frequency and an output voltage of the PWM inverter; a current detector for detecting an output current of two or more phases of the PWM inverter; The circuit includes: a torque current detection unit that calculates a torque current of the induction motor from the current detector; an excitation current detection unit that calculates an excitation current; a torque current error setting unit that sets a torque current error when there is no load; Torque current calculating means for calculating a torque current from the torque current detecting means and the torque current error setting means, and calculating a primary current from the torque current detecting means and the exciting current detecting means 1
Next current calculating means, exciting current setting means in which the exciting current of the induction motor is set in advance, exciting voltage compensating means for proportionally integrating controlling the difference between the exciting current setting means and the exciting current detecting means, and setting the output frequency. Frequency setting means, V / F pattern calculating means for determining the relationship between the induced voltage of the induction motor and the frequency setting means, induction motor constant setting means in which constants of the induction motor are set in advance, and V / F pattern calculating means Primary voltage calculating means for calculating a primary voltage from the motor constant setting means, the primary current calculating means, the torque current calculating means, the exciting current detecting means, and the exciting voltage compensating means, and the torque current calculating means A slip frequency calculating means for calculating a slip frequency from the exciting current setting means and the induction motor constant setting means and limiting a maximum value; and From the stage and the slip frequency calculation means 1
Control of an induction motor, comprising: primary frequency calculating means for calculating a next frequency; PWM calculating means for calculating a PWM pulse from the primary voltage calculating means and the primary frequency calculating means; and performing PWM pulse control. apparatus.
定めたパターンをもたせるよう周波数ごとに係数を掛け
る係数演算手段を備えた請求項１記載の誘導電動機の制
御装置。2. The control device for an induction motor according to claim 1, wherein said exciting current setting means includes coefficient calculating means for multiplying a coefficient for each frequency so as to have a pattern determined by the frequency.
のみ出力するよう制限する励磁補正制限手段と出力遮断
停止時に積分値をリセットするリセット手段を備えた請
求項１記載の誘導電動機の制御装置。3. The control of an induction motor according to claim 1, wherein said excitation voltage compensating means includes excitation correction limiting means for limiting output to only a zero or positive value, and reset means for resetting an integral value when output cutoff is stopped. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14049693A JP3301165B2 (en) | 1993-06-11 | 1993-06-11 | Induction motor control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14049693A JP3301165B2 (en) | 1993-06-11 | 1993-06-11 | Induction motor control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06351295A JPH06351295A (en) | 1994-12-22 |
| JP3301165B2 true JP3301165B2 (en) | 2002-07-15 |
Family
ID=15269984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14049693A Expired - Fee Related JP3301165B2 (en) | 1993-06-11 | 1993-06-11 | Induction motor control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3301165B2 (en) |
-
1993
- 1993-06-11 JP JP14049693A patent/JP3301165B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06351295A (en) | 1994-12-22 |
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